OK... FIRST things first: Please understand that nobody here is a magic leprechaun - and we also are not mind readers. Saying 'it doesnt work' doesnt help us know what the problem is.
Can you please post and tell us what happens when you try to run DOD, including the exact error messages or problems that occure.
Also, is it safe to assume that in the past you have used this computer to play DOD:S, or are you just trying to play them now. If you have played in the past, then please let us know what has happened since then - was it all of a sudden, did you BSOD, get a virus etc. Thanks in advance.